3. Subjects with the diagnosis of bipolar I, bipolar II, or bipolar spectrum disorder and currently displaying manic, hypomanic, or mixed symptoms (with or without psychotic features), by DSM-IV (Diagnostic and Statistical Manual IV), as manifested in clinical evaluation and/or the Mania module of the structured interview, completed by the study clinician. Bipolar Spectrum Disorder (or sub-threshold bipolar disorder) is operationalized as having severe mood disturbance, which meets DSM-IV Criteria A for bipolar disorder but displays fewer elements in Criteria B (only require 2 items for elation category and 3 for irritability)